The cosmic microwave background radiation permeating the universe is the afterglow of the Big Bang, 13.8 billion years old.
Fact #4065
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The Milky Way is just one of billions of galaxies in the universe.
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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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The observable universe is about 93 billion light‑years wide.
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The Moon is slowly moving away from Earth.
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The observable universe spans billions of light-years.
Fact #1611 · Space
The observable universe is about 93 billion light‑years wide.
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Black holes can bend light through gravitational lensing.
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